Xenology, FUN Anomalies and the Plutonium-244 Story

It has long been generally accepted that 244Pu fission xenon is absent in lunar fines, while carbonaceous chondrites contain the so-called xenon-HL, which is a strange fission-like xenon component, whose isotopic composition is different from that of the 244Pu fission xenon. Re-examination of a vast amount of existing xenon isotope data reveals, however, that lunar fines and carbonaceous chondrites both contain appreciable amounts of 244Pu fission xenon and they began to retain their xenon almost 5.1 billion years ago, when the 244Pu to 238U ratio in the solar system was roughly 1 to 2 (atom/atom). In the present paper, re-examination of the experimental data is extended to the lead/lead and potassium/argon dating methods.